Change QuicAckFrame's revived_packets to be a single QuicPacketNumber. QUIC now ignores all but the…

net/quic/quic_protocol.h

Index: net/quic/quic_protocol.h
diff --git a/net/quic/quic_protocol.h b/net/quic/quic_protocol.h
index 91ab6c28dc5ff285ed57e11c92db284d56451698..70088c7fa9cc3db97d55294cff5c4bf55ad91015 100644
--- a/net/quic/quic_protocol.h
+++ b/net/quic/quic_protocol.h
@@ -867,9 +867,9 @@ struct NET_EXPORT_PRIVATE QuicAckFrame {
   // The set of packets which we're expecting and have not received.
   PacketNumberQueue missing_packets;
 
-  // Packets which have been revived via FEC.
-  // All of these must also be in missing_packets.
-  PacketNumberSet revived_packets;
+  // Packet most recently revived via FEC, 0 if no packet was revived by FEC.
+  // If non-zero, must be present in missing_packets.
+  QuicPacketNumber latest_revived_packet;
 };
 
 // True if the packet number is greater than largest_observed or is listed